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An On-Chip Delay Measurement Technique Using Signature Registers for Small-Delay Defect Detection

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3 Author(s)
Katoh, K. ; Electr. Eng. Dept., Tsuruoka Nat. Coll. of Technol., Tsuruoka, Japan ; Namba, K. ; Ito, H.

This paper presents a delay measurement technique using signature analysis, and a scan design for the proposed delay measurement technique to detect small-delay defects. The pro- posed measurement technique measures the delay of the explicitly sensitized paths with the resolution of the on-chip variable clock generator. The proposed scan design realizes complete on-chip delay measurement in short measurement time using the proposed delay measurement technique and extra latches for storing the test vectors. The evaluation with Rohm 0.18-μm process shows that the measurement time is 67.8% reduced compared with that of the delay measurement with standard scan design on average. The area overhead is 23.4% larger than that of the delay measurement architecture using standard scan design, and the difference of the area overhead between enhanced scan design and the proposed method is 7.4% on average. The data volume is 2.2 times of that of test set for normal testing on average.

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Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:20 ,  Issue: 5 )